Phase Transformation in NiTi Finished Medical Devices with High Precision Vision Technology

Precise phase transformation measurements can lead to optimized mechanical properties of shape memory alloys that is to achieve optimum stiffness and ductility. The proposed high-precision vision technology - a non-contact active Af temperature measuring system - is used to measure and characterize various forms, shapes and alloys.

Our study will investigate the use of the high-precision vision technology to determine local Af temperature within medical devices having zones of distinct forces and varying transformation temperatures (archwires), long peripheral devices (braided stents) and miniature neurovascular implants; and also enable phase transformation measurement of ultrafine shape memory actuating fibers (10-100 microns).

Keywords—nitinol; bend free recovery; archwires; braided-stents; fiber; actuator